Improvement in safety-valves



the escape of steam.

@duit-r11 gieten WALTER. DAWSON, or scnANTo'N, PENNSYLVANIA.

Letters Patent No. 97 ,485, dated December 7, 1869.

IMPROVEMENT IN SAFETY-VALVES.

The Schedule referred to in these Letters Patent and making prr of the same To all whom it may concern Be it known that I, WALTER DAWSON, of Scranton,in the county of Luzerne, and State of Pennsylvania, have invented a new and improved Safety- Valve, and I do hereby declare that` the following is a full, clear, and exact description thereof, which will enable others skilled in the ait to make and use the same, reference being had to the accompanying-drawings, forming part of this specification.

Figure l represents a sectional side view of my l improved safety-valve.

valves, such as are usedl upon locomotive-engines;

and A rIheimprovemeut consists in the construction and arrangement of part-s, as hereinafter described.

In carrying out my invention, I provide a valve with a iiat surface, and an annular aperture for the.

escape of the steam, with a iiat horizontal bearingsurface. I also provide the valve with an inverted guide-socket, for receiving a central guide-pin, which is fixed to the seat.y A

A, in the drawing, represents a shell or tube, which, in connect-i011 with a central disk, forms the valveseat.

The shell or tube A has within it, supported by means of arms'a a., a central disk, B', between which and the shell or tube A is an annular opening, b, for

The face of the disk B is flush with a portion of' the upper edge of the tube or shell A, as shown in the figures, and the valve when closed rests in part A upon the shell or tube A, and in part upon disk B. in such a manner as entirely to cover the annular spring b.

A pintle, c, projects upward from the centre ci' the disk B.

The shell or tube A is ntted upon the boiler or steam-generator, in the ame manner as any other safety-valve.

O is the valve, consisting `of an open ring with a ilat face, and having connected with it, by arms d d, a central socket, e, which receives the pintle c.

The valve is guided by the socket e, and moves up and down upon the pintle c.

The valve is of such size that it will, cover the annular aperture b.

When the valve israised, the steam freely escapes through the annular opening b, both around and within the valve l The socket e being in an inverted position on the valve, will not retain dust or other impurities entering it, and will therefore never become clogged.

I am aware that iat valves and seats are not in themselves new.

Having thus described my invention,

I claim-as new, and desire to secure by Letters Patent- The combination, with tbeat valveand seat, of 4 Witnesses:

A. E. BEACH, EDGAR lTA'rn. 

